<meta charset="utf-8">
(#) Obsolete layout params

!!! WARNING: Obsolete layout params
   This is a warning.

Id
:   `ObsoleteLayoutParam`
Summary
:   Obsolete layout params
Severity
:   Warning
Category
:   Performance
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   Initial
Affects
:   Resource files
Editing
:   This check runs on the fly in the IDE editor
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/ObsoleteLayoutParamsDetector.java)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/ObsoleteLayoutParamsDetectorTest.java)
Copyright Year
:   2011

The given layout_param is not defined for the given layout, meaning it
has no effect. This usually happens when you change the parent layout or
move view code around without updating the layout params. This will
cause useless attribute processing at runtime, and is misleading for
others reading the layout so the parameter should be removed.

!!! Tip
   This lint check has an associated quickfix available in the IDE.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
res/layout/wrongparams.xml:11:Warning: Invalid layout param in a
FrameLayout: layout_weight [ObsoleteLayoutParam]
    android:layout_weight="1"
    -------------------------
res/layout/wrongparams.xml:23:Warning: Invalid layout param in a
LinearLayout: layout_alignParentLeft [ObsoleteLayoutParam]
    android:layout_alignParentLeft="true"
    -------------------------------------
res/layout/wrongparams.xml:24:Warning: Invalid layout param in a
LinearLayout: layout_alignParentTop [ObsoleteLayoutParam]
    android:layout_alignParentTop="true"
    ------------------------------------
res/layout/wrongparams.xml:33:Warning: Invalid layout param in a
LinearLayout: layout_alignBottom [ObsoleteLayoutParam]
    android:layout_alignBottom="@+id/button1"
    -----------------------------------------
res/layout/wrongparams.xml:34:Warning: Invalid layout param in a
LinearLayout: layout_toRightOf [ObsoleteLayoutParam]
    android:layout_toRightOf="@+id/button1"
    ---------------------------------------
res/layout/wrongparams.xml:42:Warning: Invalid layout param in a
LinearLayout: layout_alignLeft [ObsoleteLayoutParam]
    android:layout_alignLeft="@+id/button1"
    ---------------------------------------
res/layout/wrongparams.xml:43:Warning: Invalid layout param in a
LinearLayout: layout_below [ObsoleteLayoutParam]
    android:layout_below="@+id/button1"
    -----------------------------------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here is the source file referenced above:

`res/layout/wrongparams.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" &gt;

    &lt;Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Button" /&gt;

    &lt;LinearLayout
        android:id="@+id/relativeLayout1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" &gt;

        &lt;Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:layout_marginLeft="17dp"
            android:layout_marginTop="16dp"
            android:text="Button" /&gt;

        &lt;TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBottom="@+id/button1"
            android:layout_toRightOf="@+id/button1"
            android:text="Medium Text"
            android:textAppearance="?android:attr/textAppearanceMedium" /&gt;

        &lt;RadioButton
            android:id="@+id/radioButton1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/button1"
            android:layout_below="@+id/button1"
            android:text="RadioButton" /&gt;
    &lt;/LinearLayout&gt;
    &lt;TableLayout
        android:id="@+id/tableLayout1"
        android:layout_width="match_parent"
        android:layout_height="match_parent" &gt;

        &lt;TableRow
            android:id="@+id/tableRow1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" &gt;

            &lt;Button
                android:id="@+id/button3"
                android:layout_column="0"
                android:layout_span="1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Button" /&gt;
        &lt;/TableRow&gt;

        &lt;Button
            android:id="@+id/button4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Button" /&gt;
    &lt;/TableLayout&gt;

    &lt;GridLayout
        android:id="@+id/gridLayout1"
        android:layout_width="match_parent"
        android:layout_height="match_parent" &gt;

        &lt;Button
            android:id="@+id/button10"
            android:layout_column="0"
            android:layout_row="0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" /&gt;
    &lt;/GridLayout&gt;

&lt;/FrameLayout&gt;

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/ObsoleteLayoutParamsDetectorTest.java)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `ObsoleteLayoutParamsDetector.test`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Adding the suppression attribute
  `tools:ignore="ObsoleteLayoutParam"` on the problematic XML element
  (or one of its enclosing elements). You may also need to add the
  following namespace declaration on the root element in the XML file
  if it's not already there:
  `xmlns:tools="http://schemas.android.com/tools"`.

  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;include xmlns:tools="http://schemas.android.com/tools"
      tools:ignore="ObsoleteLayoutParam" ...&gt;
    ...
  &lt;/include&gt;
  ```

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="ObsoleteLayoutParam" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'ObsoleteLayoutParam'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore ObsoleteLayoutParam ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

<!-- Markdeep: --><style class="fallback">body{visibility:hidden;white-space:pre;font-family:monospace}</style><script src="markdeep.min.js" charset="utf-8"></script><script src="https://morgan3d.github.io/markdeep/latest/markdeep.min.js" charset="utf-8"></script><script>window.alreadyProcessedMarkdeep||(document.body.style.visibility="visible")</script>